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I'm a bit confused with the way Cura lays support structures sometimes. I'm currently printing an upright cylinder and cura has decided it should be completely filled with support, but there is nothing above to support.

I've played around with all the settings that seem to make a difference and I can increase/decrease the width of support which can save a huge amount of time and material, but I can't dial out this unnecessary material use in some areas.

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I agree with the images or the model to have a better chance of evaluation, but have you tried the support horizontal expansion? It defaults to 3mm and I routinely turn it down to 0.25mm, sometimes a value of 0.5mm and even 0mm sometimes. saves a lot on PVA too.